DocumentCode :
1115729
Title :
Impact of Pilot Design on Achievable Data Rates in Multiple Antenna Multiuser TDD Systems
Author :
Samardzija, Dragan ; Mandayam, Narayan
Author_Institution :
Bell Labs., Holmdel
Volume :
25
Issue :
7
fYear :
2007
fDate :
9/1/2007 12:00:00 AM
Firstpage :
1370
Lastpage :
1379
Abstract :
In this paper we study the effects of practical pilot- assisted channel state estimation on the achievable information theoretic data rates (uplink and downlink) in a multiple antenna multiuser TDD system. Specifically, we consider a wireless system with multiple antennas at the base station and a number of mobile terminals each with a single antenna. We analyze the performance of uplink multiuser detection and downlink transmitter optimization that are based on linear spatial filtering. Using a discrete version of the continuously time-varying wireless channel we analyze how a lower bound on the achievable data rates depends on (1) the arrangement of pilot symbols (preamble or postamble); (2) the duration of the uplink and downlink transmissions; and (3) the percentage power allocated to the pilot. Furthermore, we also present the effects of the terminal speeds on the achievable data rates, thereby providing prescriptions for the practical design of the pilot. Specifically, our results point to an uplink postamble with flexible percentage (about 20 - 25 %) pilot power allocation, and transmission durations tailored for specific ranges of terminal speeds.
Keywords :
antenna arrays; channel estimation; mobile radio; multiuser detection; time division multiplexing; time-varying channels; wireless channels; achievable data rates; base station; continuously time-varying wireless channel; downlink transmitter optimization; linear spatial filtering; mobile terminals; multiple antenna multiuser TDD systems; pilot design; pilot symbols; pilot-assisted channel state estimation; single antenna; uplink multiuser detection; wireless system; Antenna theory; Base stations; Channel estimation; Downlink; Filtering; Mobile antennas; Multiuser detection; Nonlinear filters; Performance analysis; Transmitters;
fLanguage :
English
Journal_Title :
Selected Areas in Communications, IEEE Journal on
Publisher :
ieee
ISSN :
0733-8716
Type :
jour
DOI :
10.1109/JSAC.2007.070910
Filename :
4299607
Link To Document :
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